Rheology and plasticity

Solutions of thermoresponsive tubes : jamming of cylindrical objects

Contact : A. Saint-Jalmes

In collaboration with INRA at Nantes, we have studied solutions of hydroxystearic acids, associated with alkanolamine counterions. It turns out that - with alkanolamine - the 12-hydroxystearic acid can be solubilized : it self-organizes in long (10 microns) multi-wall tubes.
These supramolecular structures also reversibly evolve with temperature : under heating, the tubes first grow in diameter (up to Tmax), then they shrink, before finally vanishing and forming small micelles above a temperature Tmelting.

 

Références

  • “Yielding and flow of solutions of thermoresponsive surfactant tubes: tuning macroscopic rheology by supramolecular assemblies”  A.L. Fameau and A. Saint-Jalmes. Soft Matter, 10, 3622  (2014). DOI : 10.1039/c3sm53001a

 

  • Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds Anne-Laure Fameau, Fabrice Cousin, Arnaud Saint-Jalmes. Langmuir, 33, 12943 (2017). DOI: 10.1021/acs.langmuir.7b02651

Fluidization of a granular solid

contact : A. Amon, J. Crassous

Références :

A. Pons, T. Darnige, J. Crassous, E. Clément, A. Amon "Spatial repartition of local plastic processes in different creep regimes in a granular material", EPL 113, 28001 (2016).

A. Pons, A. Amon, T. Darnige, J. Crassous, E. Clément, "Mechanical fluctuations suppress the threshold of soft-glassy solids: The secular drift scenario", Phys. Rev. E 92, 020201(R) (2015).

A. Amon, V. B. Nguyen, A. Bruand, J. Crassous, E. Clément, "Hot Spots in an Athermal System", Phys. Rev. Lett. 108, 135502 (2012).